A comprehensive biography of the Treatise of the Three Impostors, a controversial nonexistent medieval book.
Like a lot of good stories, this one begins with a rumor: in 1239, Pope Gregory IX accused Frederick II, the Holy Roman Emperor, of heresy. Without disclosing evidence of any kind, Gregory announced that Frederick had written a supremely blasphemous book-De tribus impostoribus, or the Treatise of the Three...
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